Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Dynamic Modeling and Motion Analysis of Unmanned Underwater Gliders with Mass Shifter Unit and Buoyancy Engine

이동질량장치와 부력엔진을 포함한 무인 수중글라이더의 동역학 모델링 및 운동성능 해석

  • Kim, Donghee (Department of Mechanical Engineering, Korea Maritime and Ocean University) ;
  • Lee, Sang Seob (Department of Mechanical Engineering, Korea Maritime and Ocean University) ;
  • Choi, Hyeung Sik (Division of Mechanical and Energy Systems Engineering, Korea Maritime and Ocean University) ;
  • Kim, Joon Young (Division of Marine Equipment Engineering, Korea Maritime and Ocean University) ;
  • Lee, Shinje (Korea Institute of Ocean Science and Technology) ;
  • Lee, Yong Kuk (Korea Institute of Ocean Science and Technology)
  • 김동희 (한국해양대학교 기계공학과) ;
  • 이상섭 (한국해양대학교 기계공학과) ;
  • 최형식 (한국해양대학교 기계.에너지시스템공학부) ;
  • 김준영 (한국해양대학교 조선기자재공학부) ;
  • 이신제 (한국해양과학기술원) ;
  • 이용국 (한국해양과학기술원)
  • Received : 2014.05.04
  • Accepted : 2014.10.24
  • Published : 2014.10.31
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Abstract

Underwater gliders do not have any external propulsion systems that can generate and control their motion. Generally, underwater gliders would obtain a propulsive force through the lift force generated on the body by a fluid. Underwater gliders should be equipped with mechanisms that can induce heave and pitch motions. In this study, an inner movable and rotatable mass mechanism was proposed to generate the pitch and roll motions of an underwater glider. In addition, a buoyancy control unit was presented to adjust the displacement of the underwater glider. The buoyancy control unit could generate the heave motion of the underwater glider. In order to analyze the underwater dynamic behavior of this system, nonlinear 6-DOF dynamic equations that included mathematical models of the inner movable mass and buoyancy control unit were derived. Only kinematic characteristics such as the location of the inner movable mass and the piston position of the buoyancy control unit were considered because the velocities of these systems are very slow. The effectiveness of the proposed dynamic modeling was verified through sawtooth and spiraling motion simulations.

Keywords

Acknowledgement

Supported by : 국방과학연구소

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